IJE TRANSACTIONS A: Basics Vol. 29, No. 4 (April 2016) 454-463   

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S. Binbin, G. Song, W. Zhe and L. Junwei
( Received: February 25, 2016 – Accepted in Revised Form: April 14, 2016 )

Abstract    To achieve higher economy of the original driving scheme with single motor and settled gear ratio, new configurations with different powertrain systems in front and rear axle were designed. Firstly, according to the power and torque required by a micro electric vehicle (mEV) in various drive cycles, the parameters of a small and high power motor were determined. Secondly, for schemeⅠwith dual motor and one-speed gearbox, based on genetic algorithm (GA), theoptimal transmission and torque distribution were confirmed. Owing to the use of single-motor-drive mode (SMDM), the simulated energy consumption decreases by 4.01% compared with the original scheme, but the motor efficiency is still relatively low under low-speed conditions (0-1000r/min) due to the fixed transmission. Then, to solve this problem, scheme using two-speed gearbox to substitute the original one in rear axle was proposed. For this scheme, first of all, the explicit relation of energy consumption and the two-speed ratios was established based on response surface methodology (RSM); then hill climbing method was used to search the best ratios. ّFinally, economy performances of different schemes were discussed in simulation model and energy consumption of this scheme decreases by 7.55% compared with the original one.


Keywords    Micro electric vehicle, Dual motor, Powertrain system, Response surface methodology, parameters design


چکیده    برای رسیدن به اقتصاد بالاتر، طرح رانندگی اصلی با نسبت تک موتور و دنده، تنظیمات جدید با سیستم انتقال قدرت متفاوت در جلو و محور عقب طراحی شده بود. ابتدا، با توجه به قدرت و گشتاور مورد نیاز وسیله نقلیه الکتریکی میکرو (mEV) در دوره های مختلف رانندگی، پارامترهای یک موتور قدرتی کوچک و بالا مشخص شد. در مرحله دوم، برای طرح Ⅰ با موتور دوگانه و یک جعبه دنده سرعت، بر اساس الگوریتم ژنتیک (GA)، انتقال theoptimal و توزیع گشتاور تایید شد. با توجه به استفاده از حالت رانندگی تک موتور (SMDM)، مصرف انرژی شبیه سازی شده در مقایسه با طرح اصلی 01/4% کاهش یافت، اما راندمان موتور هنوز هم در شرایط کم سرعت (0-1000 دور بر دقیقه) به علت انتقال ثابت نسبتا پایین است. سپس، برای حل این مشکل، طرح با استفاده از گیربکس دو سرعته به جای یکی از گیربکس های اصلی در محور عقب پیشنهاد شده است. برای این طرح، اول از همه، رابطه صریح و روشن مصرف انرژی و نسبت دو سرعت بر اساس روش سطح پاسخ (RSM) تاسیس شد. پس از آن، روش بالا رفتن از تپه برای جستجوی بهترین نسبت استفاده شد. در نهایت، اجرای اقتصادی طرح های مختلف در مدل شبیه سازی مورد بحث قرار گرفت و مصرف انرژی این طرح در مقایسه با طرح اصلی 55/7% کاهش می یابد.


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